Agassiz, Louis, 168, 169.
Air, light and heavy, 72, 73.
Albatross, 38.
Animal life, abundance, 11, 12.
Antlers, 201.
Ants, 11.
Army trucks, 110, 111.
Arum, 196.
Automobile trip, 109-26.
Bacon, Francis, 186.
Barton, W. Va., 119.
Bee, honey, spirit of the hive, 152, 158-62;
intelligence, 156, 157;
communication, 159, 160;
their world, 161;
sting, 165.
Bee, leaf-cutter, 14, 15.
Beech, autumn color, 3.
Birds, living with, 31;
flight, 32-38;
and cats, 56;
nesting near houses, 54-59;
home sense, 59;
nests of most species built by the females, 64, 65;
and dead trees, 84, 85;
song, 86;
at Pine Knot, Va., 102-05;
of southern California, 129-32;
community of mind in flocks, 153, 154.
Birds' nests, finding, 79-81.
Bluebird, endearing qualities, 43;
nesting, 43, 44, 54;
experience with a pair, 44-48.
Bobolink, song flight, 38, 85.
Bolar Springs, 117.
Brain, as organ of the mind, 22, 23.
Buffon, Georges Louis Le Clerc, 157.
Bumble-bee, carpenter, 36.
Bunting, indigo, nesting, 90, 91.
Bunting, painted, 114.
Butterflies, flight, 34;
flocking, 155.
Butterfly, monarch, 34, 35, 155.
Buzzard, turkey, 32-34.
Cacti, 143-48.
California, southern, observations in, 127-51;
coast, 127;
mountains, 127, 128;
climate and soil, 128;
bird-song, 128, 129;
birds, 129-32;
change of climate in, 210-12.
Cambium layer, 5, 6.
Carpenter, W. B., quoted, 194.
Catbird, 30;
stealthiness, 60, 67, 68;
experience with a pair, 60-66;
fondness for butter, 66;
theatrical, 68;
notes, 87.
Caterpillars, 91-94.
Causes, 165-67.
Cedar-bird, 65.
Chance, in animal life, 208, 209.
Cheat River, W. Va., 116.
Chipmunks, two in a den, 11;
storing currants, 17;
carrying provender, 96, 97.
Chippie. _See_ Sparrow, chipping.
Chlorophyll, 190, 191.
Chrysalis, 12.
Condor, 33, 34.
Connellsville, Pa., 113.
Cormorant, 132.
Cosmos, the, order and harmony of, 191-93.
Cow, 205.
Crow, flight, 37;
needs no great wing-power, 180.
Crow, fish, 55, 56, 68.
Cuckoo, 71, 72, 87;
solemnity, 88;
nesting, 88, 89;
young, 89;
nest, 90;
food, 90.
Cuckoo, black-billed, notes, 87, 88;
nesting-habits, 88.
Cuckoo, yellow-billed, 87.
Dana, Richard Henry, Jr., at San Diego, 210, 211.
Darwin, Charles, quoted, 5,17, 18, 33;
his eager study of natural history, 17, 18;
observations during the voyage of the Beagle, 18, 19;
failure of his theory, 147, 167-69;
his mind, 173;
treated man as an animal, 174.
Darwin, George Howard, on the tides, 169, 170.
Darwinism, a cause of the World War, 172-75.
Death, an analogy of, 185, 186.
Desert, vegetation of the, 143-48.
Dove, mourning, _or_ turtle-dove, 86.
Earth, the, quiverings of the surface, 169-71;
the Northern and Southern Hemispheres, 171, 172.
Edison, Thomas A., 114, 119;
contrasted with Mr. Ford, 122-25.
Elm, autumn color, 3.
Emerson, Ralph Waldo, quoted, 69, 165, 186.
Erosion, as sculpture, 181-83.
Fabre, Jean Henri, 162;
quoted, 139.
Far-away, the, 39.
Fear in animals, 58, 59, 154, 155, 209.
Fireflies, 19.
Firestone, H. S., 119, 125.
Fish, schools of, 154.
Fleas, 210.
Flies, intelligence, 156, 157.
Foraminiferæ, 194.
Ford, Henry, 113, 114, 119, 120;
contrasted with Mr. Edison, 122-24.
Foxes, 180.
Frog, wood, 94, 95.
Germans, Darwinism, and the World War, 172-75.
Giraffe, 200.
Girls, two West Virginia, 115.
Gnatcatcher, blue-gray, 103.
God, man appropriating, 199.
Goldfinch, flight, 37, 42;
chorus singing, 40-42;
notes, 42;
notes of young, 43;
nesting, 43.
Grand Cañon, 182, 194.
Grass, the wonder of, 74, 75.
Grasshoppers, 155.
Great Smoky Mts., 109.
Greensborough, Pa., 112.
Grosbeak, rose-breasted, nesting, 65.
Grouse, ruffed, 166.
Gull, herring, 131.
Gulls, flight, 38.
Hawk, red-tailed, 32.
Hawks, flight, 35.
Haymaking, 69-76.
Hen-hawk, flight, 35.
Hornets, 163.
Horns, 201, 202.
Horse, 205, 206.
Horseshoe Run, W. Va., 114.
Hummingbird, ruby-throated, 64;
bathing in dew, 13;
nest, 79;
a fairy bird, 94.
Hurley, Edward N., 113.
Huxley, Thomas Henry, 27;
quoted, 8, 25.
Ibis, white, 32, 153, 154.
Insects, their world, 23-25, 162;
senses, 24;
reaction to heat,
cold, and vibrations, 25;
antennæ, 25;
the ruling sex among, 140, 141.
Interpretation, 186-90.
Ironweed, 116.
James, William, 22.
Jay, blue, notes, 87.
Joe-Pye-weed, 116.
Junco, young, 19, 20;
nesting, 81;
abundance, 82.
Kepler, Johann, 169.
Killdeer, 130, 131.
Kingbird, flight, 37;
and bees, 156.
Leaves, autumn, 1-3.
Lemmings, 152, 153.
Life, origin of, 194, 195.
Life, human, analogies, 25-27.
Lightning-bugs. _See_ Fireflies.
Lowell, James Russell, quoted, 5.
Lubbock, Sir John, quoted, 156.
McCarthy, Denis Aloysius, quoted, 157.
Maeterlinck, Maurice, quoted, 23, 162;
on the bee, 156-63.
Man, and Darwinism, 174;
a part of nature, 184-86;
interpretation of nature and of himself, 186-90;
mystery of his evolution, 216.
Maple, sugar, susceptibility to atmospheric changes, 72, 73.
Maples, autumn color, 3.
Marcus Aurelius, quoted, 185.
Meadowlark, song flight, 37.
Measuring-worm, 91, 92.
Mice, wild, 16;
barking trees, 27, 28.
Microphone, 170, 171.
Microseisms, 170.
Mind, community of, 152-55.
Mockingbird, 68.
Moose, 200.
Mosquitoes, 210.
Moth, luna, 97.
Mouse, jumping, 166, 167.
Mouse, white-footed, 166.
Mullets, 154.
Natural history about home, 39, 40.
Nature, her methods unlike ours, 179-81, 199;
interpreting, 186-90;
lavishness and parsimony, 195, 196, 209;
puzzling and contradictory, 201, 202;
all-seeing, 212-14;
her movements circular, 214-16.
Nighthawk, 104.
Nonpareil, _or_ painted bunting, 114.
North Carolina, a countryman of, 121.
Northern Hemisphere, 171, 172.
Oak, autumn color, 3.
Odd and even numbers, 163-65.
Oriole, Baltimore, 30, 56;
nest, 48-52, 64.
Oriole, Bullock's, nest, 52.
Oriole, orchard, nest, 52.
Osborn, Henry Fairfield, on the origin of life, 194, 195.
Ostrich, 200.
Owl, screech, 45-47.
Pacific Ocean, 127.
Pain, 209.
Pear-trees, autumn color, 1.
Pelican, California brown, 131, 132.
Pennsylvania, motor trip through, 109-13.
Pewee, wood, nest, 52, 64;
its plaint, 87.
Phœbe, flight, 37;
nest, 52-54, 56, 59, 60, 64, 79, 80.
Pigeon, wild, 103, 104.
Pine Knot, Va., visit to, 101-08.
Pipit, American, 129;
nest, 129, 130.
Pittsburgh, 111.
Plover, killdeer, 130, 131.
Porcupine, 166.
Rabbit, its protection, 166;
caught by a weasel, 177, 178.
Rainbow tints, in dew, etc., 13, 14.
Rat, wood, 207 _note_.
Reasons, 165-67.
Redstart, 29.
Road-mending, 11.
Robin, young, 19;
nest, 53-55, 64, 176;
fear of man, 57, 58;
fittest to survive, 175, 176;
versatility, 176;
a hustler, 176;
danger of a plague of robins, 177;
a runner, 177.
Rocks, origin of the secondary, 200.
Roosevelt, Theodore, visit to Pine Knot, Va., with, 101-08;
knowledge of India, 101;
opinion of Taft, 105;
killing a mosquito, 105, 106;
protection of the President, 106;
bird-gazing, 107;
letter from, 107, 108.
Salamander, orange-colored, 95, 96.
San Diego, Cal., 210-12.
Sandstone, in the Catskills, 20.
Sap, 6-8.
Sapsucker, yellow-bellied, 6.
Scorpion, 23.
Seals, hair, in California, 148-51.
Sex, the ruling, 140, 141.
Shaler, Nathaniel S., quoted, 169;
on the Northern and Southern Hemispheres, 171, 172.
Shrew, 16.
Skunk, 206-08.
Snakes, 11.
Sources, original, 190, 191.
South, characteristics of the, 120, 121.
Southern Hemisphere, 171, 172.
Sparrow, story of a nest, 98, 99.
Sparrow, chipping _or_ social, nest, 53, 54.
Sparrow, song, song flight, 37;
nesting, 54;
singing, 85, 86.
Sparrow, vesper, nesting, 80-84;
its names, 82;
appearance and habits, 82, 83;
courted by a skylark, 83.
Species, origin of, an insoluble problem, 167-69, 199.
Spider, trap-door, 132-43.
Spiders, 12, 23;
genius of, 136.
Spider-webs, rainbows in, 13, 14.
Squirrel, gray, caught by a weasel, 178.
Squirrel, red, chased by a weasel, 178.
Strawberry-vines, wild, 212-14.
Struggle, 203, 204.
Sunrise, 197, 198.
Survival of the fit, 201, 203.
Swallow, bank, 78.
Swallow, barn, 71;
parental anxiety, 76, 77;
notes, 76, 77;
pleasing qualities, 77, 78.
Swallow, cliff, 77.
Swallow, tree, 78.
Swallows, feeding, 15, 16;
hibernation, 78.
Swift, chimney, 36.
Sycamore, autumn color, 3.
Taft, William Howard, 105.
Telepathy, 155.
Thistle, Canada, 202.
Thorns, the use of, 143-48.
Thrasher, brown, 67, 68.
Thrush, Alaska hermit, 129.
Thrush, hermit, song, 87.
Thrush, olive-backed, 30.
Thrush, Wilson's. _See_ Veery.
Thrush, wood, 30, 64;
manners, 67, 68.
Tides, the, 169, 170, 193, 194.
Titlark. _See_ Pipit.
Trees, leaves, 1-3;
mechanism of growth, 4-8;
roots and rootlets, 4-6;
what man has in common with, 9, 10.
Tree-toad, 71.
Turnip, Indian, 196.
Turtle-dove. _See_ Dove, mourning.
Uniontown, Pa., 113.
Universe. _See_ Cosmos.
Van Dyke, John C., on desert plants, 145, 146.
Veery, nesting, 97, 98.
Vireo, nest, young, and mother, 99, 100.
Vireo, red-eyed, 86, 100.
Vireo, yellow-throated, 30.
Vital principle, 8, 9.
Warbler, Audubon's, 129.
Warbler, Canada, 29.
Warbler, mourning, 29, 31.
Wasp, a solitary, 12, 13.
Water-thrush, _or_ water accentor, 79.
Waxwing, Bohemian, 21.
Weasel, catching rabbits and squirrels, 177, 178;
an inspirer of terror, 178, 179.
Weather, prophesying the, 20-22.
West Virginia, motor trip through, 114-19.
Whitman, Walt, quoted, 9, 193.
Wolf Creek, 117.
Woodcock, flight song, 32, 37.
Woodpecker, yellow-bellied, 6.
Woodpeckers, flight, 37.
World War, Darwinism a cause of the, 172-75.
Wren, Bewick's, 103.
Wren, house, 86;
and nesting-box, 29.
Wren, winter, nest, 79.
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